Abstract
Received: 2016-10-24 | Accepted: 2017-04-19 | Available online: 2017-06-20 http://dx.doi.org/10.15414/afz.2017.20.01.41-44 Concentrations of nitrite nitrogen in the water flow Caradice brook were evaluated in the years 2005-2010. Caradice brook springs in the mountains of Pohronský Inovec in the southern foot of Drienka hill and it is the right tributary of the Hron River, into which mouth near the village Kozarovce. Its length is 11.1 km. Samples of the water in longitudinal profile of the watercourse were carried out from six sampling sites, on a regular basis, in the second decade of the month. The places of taking samples were localized to include all real sources causing the pollution of watercourse. The average concentration of nitrite nitrogen during the whole period represented a value of 0.05 mg dm -3 . Its share in total inorganic forms of nitrogen (N-NO 3 - , N-NH 4 + , N-NO 2 - ) represented 1.98%. Depending on the time of sampling the lowest average concentration for the whole period was recorded in February (0.032 mg dm -3 ). Its highest average concentration was detected in May (0.065 mg dm -3 ). Seasonal dynamics regularity of concentrations of nitrite nitrogen during the whole monitored period is not reflected. Effect of sampling sites on the nitrite nitrogen concentration in the water flow was as significant as the influence of the month. In the longitudinal profile of the watercourse, we generally observed a tendency of gradual increase in the concentration from the first to the last sampling site. The lowest average concentration of nitrite nitrogen (0.025 mg dm -3 ) was found in the sampling site, which was located under the forest ecosystem and the highest (0.066 mg dm -3 ) in the sampling point located below the village Kozarovce. The most significant increase in the average concentration was found in the sampling site located under Caradice municipalities and Kozarovce, which may indicate contamination of sewage water flow. In the regulation of the Government of the Slovak Republic No. 269/2010 Coll. the recommended value for nitrite nitrogen is 0.02 mg dm -3 . Calculated values of 90-th percentile (P90) of this indicator in all sampling sites were lower than the recommended value of government regulations. Keywords: nitrite nitrogen, water flow, water quality References ABER, J.D. et al. (2002) Is Nitrogen Deposition Altering the Nitrogen Status of Northeastern Forests. American Geophysical Union . Vol. 31, 6 pp. BABOSOVA, M. and NOSKOVIC, J. (2014) The quality of atmospheric precipitation in the area of Nitra - Lower Malanta . Nitra: Slovak University of Agriculture in Nitra. 64 p. Barancikova, G. et al. (2009) Environmental Chemistry . Presov: Presov University. 251 p. BUDAY, J. (2002) Intensification of the process of removing nitrogen from sewage - substrate and product inhibition of nitrification. Bratislava, pp. 92. KABELKOVA-JANCARKOVA, I. (2002) Nitrification dynamics in a small watercourse. Water management , vol. 52, no. 8, pp. 221 – 224. Konecný, V. (1998) Geological map of the Stiavnicke hills and Pohronsky Inovec . VEDA: Bratislava. LICHVAROVA, M. et al. (2006) Properties of water. Project KEGA 3/3004/05. GOVERNMENT DECREE of the Slovak Republic No. 269/2010 Coll. NOSKOVIC, J. et al. (2010) Zitavsky luh – abiotic components . Nitra: Slovak University of Agriculture in Nitra. 157 p. NOSKOVIC, J. et al. (2011) Nature Reserve Aluvium Žitava water quality . Nitra: Slovak University of Agriculture in Nitra. 105 p. PITTER, P. (1999) Hydrochemie. Prague, pp. 568. PITTER, P. (2009) Hydrochemie. 4 th ed. Prague, pp. 568. SEBIŇ, M., PEKAROVA, P. and MIKLANEK, P. (2007) Evaluation and indirect estimation of nitrate losses from the agricultural microbasin Rybarik. Biologia , vol. 62, no. 5, pp. 569-572. VALENT, P. et al. (2011) Analysis of nitrate concentrations using nonlinear time series models. Journal of Hydrology and Hydrochemics , vol. 59, no. 3, pp. 157 – 170. doi: http://dx.doi.org/10.2478/v10098-011-0013-9
Highlights
Nitrites are found in all types of waters, in lower concentrations than nitrates and ammonia (Barančíková et al, 2009)
The lowest average concentration of nitrite nitrogen (0.025 mg dm-3) was found in the sampling site, which was located under the forest ecosystem and the highest (0.066 mg dm-3) in the sampling point located below the village Kozárovce
In the water of Čaradice brook whitch springs in the mountains of Pohronský Inovec located in the southwestern part of the Slovak Republic, the nitrite nitrogen concentration was evaluated during 2005–2010
Summary
Nitrites are found in all types of waters, in lower concentrations than nitrates and ammonia (Barančíková et al, 2009). They are originated by biochemical oxidation of ammonium nitrogen or by chemical reduction of nitrate nitrogen. Higher concentrations of nitrites are found in sewage effluent water and in some waste waters from machine engineering factories. In surface waters they are undesirable, since they have a toxic effect on water ecosystem (Lichvárová et al, 2006). The aim of the paper was to evaluate concentrations of nitrite nitrogen in the water flow Čaradice brook were evaluated in the years 2005–2010
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